watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor.6:1084617] Modules linked in: irq event stamp: 45960 hardirqs last enabled at (45959): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 hardirqs last disabled at (45960): [] sysvec_apic_timer_interrupt+0xb/0xa0 arch/x86/kernel/apic/apic.c:1095 softirqs last enabled at (340): [] asm_call_irq_on_stack+0x12/0x20 softirqs last disabled at (201): [] asm_call_irq_on_stack+0x12/0x20 CPU: 1 PID: 1084617 Comm: syz-executor.6 Not tainted 5.10.172 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:check_memory_region+0x17d/0x1f0 mm/kasan/generic.c:193 Code: 48 29 c2 e9 20 ff ff ff 48 89 d0 49 39 c2 75 92 49 0f be 02 41 83 e1 07 49 39 c1 7d 85 41 bb 01 00 00 00 5b 5d 44 89 d8 41 5c 0e 54 b4 02 48 85 d2 74 e9 48 01 ea eb 09 48 83 c0 01 48 39 d0 RSP: 0018:ffff88804ee7fa50 EFLAGS: 00000246 RAX: 0000000000000001 RBX: ffff8880363d3380 RCX: ffffffff82268f7b RDX: ffffed1006c7a671 RSI: 0000000000000008 RDI: ffff8880363d3380 RBP: 0000000000000000 R08: 0000000000000000 R09: ffff8880363d3387 R10: ffffed1006c7a670 R11: 0000000000000001 R12: dffffc0000000000 R13: ffff888057685000 R14: ffffed1006c7a670 R15: 0000000000000000 FS: 00007f673ae3b700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556d44c58 CR3: 000000002f690000 CR4: 0000000000350ee0 Call Trace: instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] test_ti_thread_flag include/linux/thread_info.h:97 [inline] test_tsk_thread_flag include/linux/sched.h:1838 [inline] task_sigpending include/linux/sched/signal.h:359 [inline] signal_pending include/linux/sched/signal.h:371 [inline] paste_selection+0x2bb/0x4e0 drivers/tty/vt/selection.c:396 tioclinux+0x499/0x5b0 drivers/tty/vt/vt.c:3205 vt_ioctl+0x1ee5/0x2c90 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x862/0x18b0 drivers/tty/tty_io.c:2742 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x19a/0x210 fs/ioctl.c:739 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f673d8c5b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f673ae3b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f673d9d8f60 RCX: 00007f673d8c5b19 RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000004 RBP: 00007f673d91ff6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffef5c8265f R14: 00007f673ae3b300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] NMI backtrace for cpu 0 skipped: idling at default_idle+0xe/0x20 arch/x86/kernel/process.c:706 ---------------- Code disassembly (best guess): 0: 48 29 c2 sub %rax,%rdx 3: e9 20 ff ff ff jmpq 0xffffff28 8: 48 89 d0 mov %rdx,%rax b: 49 39 c2 cmp %rax,%r10 e: 75 92 jne 0xffffffa2 10: 49 0f be 02 movsbq (%r10),%rax 14: 41 83 e1 07 and $0x7,%r9d 18: 49 39 c1 cmp %rax,%r9 1b: 7d 85 jge 0xffffffa2 1d: 41 bb 01 00 00 00 mov $0x1,%r11d 23: 5b pop %rbx 24: 5d pop %rbp 25: 44 89 d8 mov %r11d,%eax 28: 41 5c pop %r12 * 2a: e9 0e 54 b4 02 jmpq 0x2b4543d <-- trapping instruction 2f: 48 85 d2 test %rdx,%rdx 32: 74 e9 je 0x1d 34: 48 01 ea add %rbp,%rdx 37: eb 09 jmp 0x42 39: 48 83 c0 01 add $0x1,%rax 3d: 48 39 d0 cmp %rdx,%rax